On the pressure indicator:
-
the cabin pressure increases to value
B (Pamb + 580 mbar (8.41 psi)).On the vertical speed indicator:
-
the cabin vertical speed must not bemore than 500 ft.min (152.39 m.min).
On the vertical speed indicator:
-
the cabin vertical speed is 0.On the pressure indicator:
-
the cabin pressure is value B (Pamb + 580 mbar (8.41 psi)).
On the AIR COND panel 30VU:
-
the OFF legend of the PACK 1
pushbutton switch comes on.On the vertical speed indicator:
-
the cabin vertical speed is 0.On the pressure indicator:
-
the cabin pressure is value B (Pamb +580 mbar (8.41 psi)).
On the lower ECAM display unit, on theCAB PRESS page:
-
the outflow valve is in the fully
closed position.On the AIR COND panel 30VU:
-
the OFF legend of the PACK 2
pushbutton switch comes on.On the pressure indicator:
-
the cabin pressure indication decreases.
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ACTION RESULT -------------------------------------------------------------------------------
-at value D (Pamb + 550 mbar
(7.97 psi)), stop the
stop-watch and write the time.
9. Calculate the leakage rate:
- leakage rate = (value C) -(value D) / time
The leakage rate is permitted
if less than 0.8 mbar/s (0.7
PSI/min)
On the AIR COND panel 30VU: On the vertical speed indicator:
-push the PACK 1 and PACK 2 - the cabin vertical speed must not be pushbutton switches (the OFF more than 500 ft.min (152.39 m.min). legend is off). On the pressure indicator:
On the CABIN PRESS section of the - the cabin pressure indication panel 25VU: decreases to the external ambient
-with the MAN V/S CTL switch, pressure.
decrease the cabin pressure
until you get a differential
pressure of 0 psi.
NOTE : The cabin vertical speed
____
must not be more than 500
ft.min (152.39 m.min).
10. Wait until the cabin is fully
depressurized then fully open
the outflow valve.
R **ON A/C 151-199, 401-499,
Subtask 05-53-00-780-052-A
A. Procedure to Measure the Leakage Rate
WARNING : DO NOT LET THE CABIN ALTITUDE CHANGE TOO FAST. SUDDEN CHANGES
_______
IN PRESSURE CAN CAUSE INJURY TO PERSONS.
WARNING : MAKE SURE THAT THE DIFFERENTIAL PRESSURE IS NOT MORE THAN THE
_______
VALUE SPECIFIED FOR THIS TEST.
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WARNING : DO NOT USE THE ECAM DISPLAYS TO READ THE CABIN PRESSURE
_______ PARAMETERS (CABIN DIFFERENTIAL PRESSURE, CABIN ALTITUDE, CABIN VERTICAL- SPEED) DURING THIS TEST. THE PRESSURES USED IN THIS TEST ARE MORE THAN THE MAXIMUM LIMIT OF THE RELATED PRESSURE SENSOR. WHEN THESE PRESSURES BECOME MORE THAN THE PRESSURE SENSOR LIMIT, ON THE ECAM DISPLAY:
-
THE CABIN DIFFERENTIAL PRESSURE INDICATION BECOMES AMBER XX
-
THE CABIN ALTITUDE INDICATION BECOMES AMBER XX
-
THE CABIN VERTICAL-SPEED INDICATION IS NO LONGER CORRECT. IF YOU DO NOT KNOW THE CORRECT CABIN PRESSURE VALUES, YOU CAN MAKE UNWANTED CHANGES IN PRESSURE THAT CAN CAUSE INJURY.
NOTE : This procedure uses the MAN V/S CTL switch on the CABIN PRESS
____ section of the panel 25VU to control the cabin pressure. This switch, spring loaded to neutral, controls the outflow valve position:
-UP: the outflow valve moves to the open position (the cabin pressure decreases)
-DN: the outflow valve moves to the closed position (the cabin
pressure increases)
We recommend:
-short action on this switch (do not hold the switch in the UP or DN position)
-that you monitor the cabin vertical speed indication to prevent sudden changes in cabin pressure.
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